index of array that is passed

Question

How do I retrieve the index of the array that is passed? The solution I currently use is sending the index too, but that doesn't feel right.

jsFiddle

var obj = {arr: [{x: 1, y: 2},{x: 3, y: 4},{x: 5, y: 6}]};

function myFunction(myObj)
{
    alert(myObj); // 5
    // alert(the index of the array that is passed); // 2
}

myFunction(obj.arr[2].x);

Answer 1

You can use Array.indexOf jsfiddle

var obj = {arr: [{x: 1, y: 2},{x: 3, y: 4},{x: 5, y: 6}]};

function myFunction(myObj)
{
    alert(obj.arr.indexOf(myObj)); 
}

myFunction(obj.arr[2]);